Combinatorial aspects of matrices (incidence, Hadamard, etc.)
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Asymptotic counting exponent for partial Hadamard matrices: determine C 23c or improve its bounds; the repository records 1 (lower) and 3 (upper).
Smallest unsolved instance of the Hadamard conjecture: determine C 23a or improve its bounds; the repository records 668 (lower) and infty (upper).
Hadamard Matrix of Order 668. Moderately interesting problem from Epoch AI’s FrontierMath: Open Problems; answers are checked by a verifier program.
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Electronic Journal of Combinatorics
Combinatorics and graph theory
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